What caliber do you have and to what speeds do you plan to tune it?
For 22 and above, there have been a couple of the V2 DonnyFL extended baffles on the Classifieds recently. These allow you to use either length barrel and you can experiment with felt, foam, rubber, etc. to change the report. I have not had as good of luck with 177 shooting in the upper 800's or higher. To be fair, the same holds true for any insert I've tried that is sized for 25 or larger.
For 177 the best so far have been the Akula and the Custom Carbon Designs inserts.
[EDIT] For 25 the best is the STO insert. And it's really good with 22 as well.
The stock extension and aluminum sleeves are tough to find.
I moved last year and haven't done an unboxing and full inventory of my extra parts. I probably have several but need to decide about selling two of my Leshiys and with what parts before selling anything individually.
And what size hands do you have? And do you shoot with any young children?
I got my first Leshiy when my boys were around 10-11 years old and the slim 3d printed grip was ideal, although a bit small for me. Not bad from the bench but not great when carrying a Leshiy around in the field.
The Carm grip extension really transforms the stock grip. If you do order from them instead of 3d print I also really like their pellet dispensers and the butt pad extension.
I have both the first and second generation Stephen Brown grips. The second gen is smaller than the first. I'm probably somewhere in between but still enjoy both of them.
There is also new grip 3D printed grip on Ebay. It appears to be a somewhat large grip but I haven't tried one.
